Hi all,
Thank you for the suggestions,
@LvW
AD620 I am using at a gain of 5.94~6 by putting a resistor of 10KOhm across. I use the high side current detection mechanism by putting a 1ohm resistor at o/p of current buffer.
In order to reduce input current , I put a 10kohm resistor at "-" input terminal of AD620 and at "+" I put a 10Kohm and another from referance to "+" terminal. I understand that instrumentation amplifiers have input buffers, so I though they would be good to measure the small volatage drop across 1 ohm.
@BradtheRad
Thank you for the waveform and explaination, I am saying about the phase change calculation and the errors that might have crept in the circuit.
Regards
Kshatriya